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Recent content by layfieldman

  1. layfieldman

    Silt Fence Installation

    There are some sub-contractors out there who use a machine called the Tommy Silt Fence Machine http://www.tommy-sfm.com/ that mechanically installs the silt fence using a a blade which pushes the silt fence into what is basically a slit trench. This is probably the fastest and cheapest way to...
  2. layfieldman

    HDPE permeabilty

    If you want information on HDPE liners I'm sure GSE (probably the worlds largest manufacturer) would be happy to assist you.
  3. layfieldman

    Slope Stability Software

    You can also look at ReSSA which was originally written for the FHWA and the software they use when teaching their courses on MSE structures.
  4. layfieldman

    landscaping retaining wall

    I would suggest that you get a design and construction manual from the National Concrete Masonry Association (NCMA) as they specialize in these structures.
  5. layfieldman

    Should a structural Engineer design MSE walls?

    I was recently involved in the redesign of a 4 tier concrete panel wall system into a slope specifically because the global stability check had been missed. This was a design/build by the general contractor who used the design provided by the MSE wall supplier. The consultant thought the it...
  6. layfieldman

    baffle

    Another fabricator/installer of floating baffles, as well as cover systems, is CWNeal out of California.
  7. layfieldman

    French Drain Flow Rates

    Thanks again but I already knew of his book and might have to run out to the library to check it out. I don't really want to pay over $100 CDN for what I'm doing though. Our company is trying to decide whether to invest in a certain system and just want to compare it to what already is available.
  8. layfieldman

    French Drain Flow Rates

    Thanks for your response. I am doing a comparison for drainage systems under sports fields and I want to do is a comparative analysis of different systems based on maximum drainage rates. The flow rates I'm looking for would be for a rock filled trench wrapped in a non-woven geotextile with...
  9. layfieldman

    Treatment riverbed soil contaminated by THC

    One possibility that you may want to look at is using a geotube. You basically fill up a geotextile tube with the dredged material, add some binding agents or other chemicals to treat the contamination, and the tube contains the sediment inside but allows water to drain out the sides. You must...
  10. layfieldman

    French Drain Flow Rates

    I'm looking for typical flow rates through a french drain with perforated pipe in it. Say 1' x 1' cross section. Does anyone have data or knows where I can get such data? Also, does anyone know of any alternates to gather flow sub surface?
  11. layfieldman

    Wanted: Practical advice on silt traps

    You can look at information from either the International Erosion Control Association (IECA) or the Erosion Control Control Technology Council (ECTC). One of the most traditional methods is for a sedimentation pond but if you have a peat bog that's probably not feasible. I think that you are...
  12. layfieldman

    Alternative to riprap in stormwater wet pond design

    You can also try using a permanent turf reinforcement matting. It is similar to biodegradable straw or coconut except that it is composed of UV stable polypropylene. It allows grass to grow through it and will provide permanent root reinforcement up to 1:1 slopes. It is also available in...
  13. layfieldman

    Roadway Fill

    I would agree with both the previous in that normally I would not want to use a material with that much fines content but it would depend on what the sub base is. I also agree not to use a dozer to mix the material as you don't want to create pockets of fines.
  14. layfieldman

    Geogrid as structural tieback for bulkhead

    I've never heard of this application but the FHWA has a great manual on mechanically stabilized earth design. A little more information would be necessary before any informed comment could be made though. My one uninformed comment on this without any further information would be how you plan...
  15. layfieldman

    French Drain

    Kilogram, Due to the extremely small size of most clay particles it would be very difficult, if not impossible, to find a fabric that would filter clay. Based strictly on AOS US sieve sizes there is a spun bond, non-woven geotextile that is used in the landscaping industry with an AOS of 170...
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